#!/usr/bin/env bash
set -euo pipefail

# -----------------------------------------------------------------------------
# CONFIGURATION
# -----------------------------------------------------------------------------
# how many days of backups to keep
RETENTION_DAYS=7

# where to store backups
BACKUPDIR=/home/oster/server/backup

# timestamp format for this run
NOW=$(date +'%Y-%m-%d_%H:%M:%S')

# -----------------------------------------------------------------------------
# LOGGING FUNCTION
# -----------------------------------------------------------------------------
log() {
  echo "[$(date +'%Y-%m-%d %H:%M:%S')] $*"
}

# -----------------------------------------------------------------------------
# PREPARE
# -----------------------------------------------------------------------------
log "Starting backup run at $NOW"
mkdir -p "$BACKUPDIR"

# -----------------------------------------------------------------------------
# DATABASE BACKUP FUNCTION
# -----------------------------------------------------------------------------
# Usage: backup_db <docker-container-name> <db-username> <output-prefix>
backup_db() {
  local container="$1"
  local db_user="$2"
  local label="$3"
  local outfile="${BACKUPDIR}/${NOW}-${label}.sql.gz"

  log "  Backing up ${label} (container: ${container}, user: ${db_user}) → ${outfile}"
  docker exec -t "${container}" \
    pg_dumpall --clean --if-exists --username="${db_user}" \
    | gzip > "${outfile}"
}

# -----------------------------------------------------------------------------
# RUN THE BACKUPS
# -----------------------------------------------------------------------------
backup_db immich_postgres          postgres    immich
backup_db authentik-postgresql-1  authentik   authentik
backup_db paperless-db-1          paperless   paperless

log "All database dumps completed."

# -----------------------------------------------------------------------------
# ROTATE OLD BACKUPS
# -----------------------------------------------------------------------------
log "Removing backups older than ${RETENTION_DAYS} days from ${BACKUPDIR}"
find "${BACKUPDIR}" \
     -maxdepth 1 \
     -type f \
     -name '*.sql.gz' \
     -mtime +${RETENTION_DAYS} \
     -print -exec rm -f {} \;

log "Backup rotation complete. Exiting."